---
title: 'Sr. Mechanical Design Engineer at Diamond Foundry'
canonical: 'https://feeny.ai/job/sr-mechanical-design-engineer-diamond-foundry-bay-area-67tx8qmwjw14'
type: 'job'
last_seen: '2026-09-08'
---

# Sr. Mechanical Design Engineer at Diamond Foundry

- **Company:** Diamond Foundry
- **Location:** Bay Area, CA
- **Compensation:** $125k–$165k
- **Employment:** full-time
- **Work type:** onsite
- **Posted:** 2025-12-11
- **Last confirmed live:** 2026-09-08
- **Apply:** https://jobs.lever.co/diamondfoundry/758725ca-4f11-417b-8737-4a87e6118556

## Job description

Diamond Foundry Inc. is solving the thermal limitation at the foundation of today's most exciting tech industries -- AI & cloud compute, electric-car power electronics, and 5G/6G wireless. We have managed to produce the world's first single-crystal diamond wafers and are now on a mission to put a diamond behind every chip. We are the rare unicorn that has grown fast and profitably. We received $515m in funding and are executing a multi-$B expansion plan for one of the greenest forms of tech manufacturing: converting greenhouse gas into diamond wafers using zero-emission energy.

Diamond Foundry is looking for a highly experienced and innovative mechanical design engineer who can lead a number of high-visibility R&D projects within the company’s Reactor Development Group. This individual will be a primary owner for the design and development of Plasma-Enhanced CVD reactor equipment and other systems used in the growth and manufacture of diamond. They must have experience leading multiple projects and teams with a strong track record of success.

## Responsibilities

- Collaborate with reactor team members and other teams in the company on new reactor systems, assemblies and parts.
- Oversee the manufacturing of machined components and guide designs from R&D to production. Perform trades on performance vs. cost to ground design decisions.
- Design and develop new reactor systems and components, applying expertise in machine design and mechanics, kinematics, thermals, and fluids to the design.
- Manage the prototyping, documentation, and manufacturing process of reactor designs, including preparing drawings and working with machine shops and vendors to fabricate new hardware
- Troubleshoot issues on existing reactor designs, working with other engineers to implement design changes that improve productivity and yield of our reactors

## Requirements

- A degree in mechanical, aerospace, or a similar engineering discipline is required. Plus, 2 to 7 years of professional experience in mechanical design.
- Prior experience with vacuum system design as found in semiconductor, aerospace, or other manufacturing industries is desired.
- Understanding and experience with various manufacturing methods with common industrial machine tools. High proficiency in CAD (SolidWorks)
- An understanding of electromechanical components and experience with PLC systems and industrial controls is desirable. A solid foundation in thermal or fluid modeling is desirable
- An optimistic, creative, and curious mindset with a strong desire to be hands-on with their hardware designs

Diamond Foundry believes in supporting our employees from the workplace to their personal and home life. We provide eligible employees with an opportunity to enroll in a variety of benefit programs, generally including health insurance, flexible spending accounts, retirement savings plans, life and disability insurance programs, and a number of programs that provide for both paid and unpaid time away from work. Perks include employee discounts to VRAI. Our benefits begin as early as your first day of employment. Medical and vision coverage are retroactive to your start date, while dental and voluntary benefits take effect once you’ve completed your enrollment.

Diamond Foundry is an Equal Opportunity Employer and considers qualified applicants for employment without regard to race, color, creed, religion, national origin, sex, sexual orientation, gender identity and expression, age, disability, veteran status, or any other protected factor under federal, state or local law.

Diamond Foundry Inc. is committed to operating in full compliance with all applicable state and federal laws. Our commitment extends to ensuring that our manufacturing and engineering departments adhere to the highest standards of legal and regulatory compliance. Additionally, these departments may have specific physical requirements to ensure the safety and efficiency of our operations. We prioritize the well-being of our employees and strive to create a work environment that promotes both legal compliance and the optimal functioning of our manufacturing and engineering processes.

Manufacturing and Engineering Departments Physical Requirements: -Use appropriate PPE and follow all safety policies, practices, and procedures. -This position will often: Sit, stand for long periods, walk, grasp, reach with hands and arms, lift below and above shoulders, bend, twist at the waist,  climb, balance, stoop, squat,  kneel, crawl, talk, hear, see, use fine finger manipulation, and complete repetitive motions. -Some tasks may require the use of ladders or stairs -Some tasks may require driving or the use of foot controls -Lift/carry and push/pull up to 50 pound

This employer participates in E-Verify and will provide the federal government with your Form I-9 information to confirm that you are authorized to work in the U.S. If E-Verify cannot confirm that you are authorized to work, this employer is required to give you written instructions and an opportunity to contact Department of Homeland Security (DHS) or Social Security Administration (SSA) so you can begin to resolve the issue before the employer can take any action against you, including terminating your employment. Employers can only use E-Verify once you have accepted a job offer and completed the Form I-9.

## About Diamond Foundry

## Company Overview
- **One-liner**: Diamond Foundry creates single-crystal diamond wafers and diamond-based semiconductors to solve the thermal limitations at the core of AI, electric vehicles, and wireless communications.
- **Entity Type**: Private (Series B, multiple debt rounds)
- **Headquarters**: San Francisco, California, USA
- **Founded**: 2013
- **Founders**: Engineers from Stanford, MIT, and Princeton (founded in 2012, incorporated 2013)

## Core Business
- Primary industry: Semiconductor Manufacturing / Advanced Materials
- Target customers: B2B, primarily enterprise partners in AI/cloud compute, electric vehicles, and 5G/6G wireless (chip makers, data center operators, automotive OEMs)
- Mission or purpose: To put diamond behind every chip and eventually deliver diamond semiconductors with 17,200x the semiconductor merit of silicon.

## Products & Services
- **[Diamond Wafer]**: Single-crystal diamond wafers designed to be placed behind high-power chips to solve thermal management. Claims 8x smaller power electronics than Tesla’s.
- **[AI & Cloud Compute]**: Diamond-powered AI datacenter solutions, leveraging diamond’s extreme thermal conductivity to enable faster, denser compute.
- **[Consumer Jewelry (VRAI)]**: Sustainably created diamond jewelry, serving as the company’s consumer-facing brand and proof of its diamond-growing capability.
- **[Electric Car Components]**: Diamond-based power electronics for electric vehicles, improving efficiency and reducing size.

## Market Standing
- **Valuation**: Not disclosed (was a unicorn as of Series B). Revenue of $350M (annual) indicates strong growth.
- **Key Metric**: Annual Revenue: $350M (as of most recent data). Total Funding: ~$523M+ across multiple rounds (Series A, B, venture, debt).
- **Notable Investors**: Not explicitly listed in provided data, but funding history includes multiple institutional investors.
- **Growth Signals**: 5 years profitable; >90% global market share for large diamond wafers; headcount up 23.5% YoY (to 259 employees); active job postings up 54.2% YoY; building the largest solar + battery farm in Europe to power its Spain foundry.

## Competitive Advantages
- **Vertically integrated manufacturing**: Designs and builds its own reactor technology and runs all operations in-house, enabling rapid scaling and cost control.
- **First-mover in diamond wafers**: Claims >90% global market share for large single-crystal diamond wafers.
- **Extreme material advantage**: Diamond has 17,200x the semiconductor merit of silicon, offering a massive physics-based moat.
- **Green manufacturing**: Crystallizes greenhouse gas into diamond using zero-emission energy; byproducts are oxygen and water.
- **Profitability**: Rare for a hardware unicorn; has been profitable for 5 years.

## Strategic Focus
- **Near-term (2023+)**: Place a diamond behind every high-power chip, solving the thermal bottleneck for AI, EVs, and 5G/6G.
- **Mid-term (2033+)**: Deliver diamond semiconductors (transistors) that outperform silicon by orders of magnitude.
- **Operational**: Scaling production capacity in the US (Wenatchee, WA) and Spain (Trujillo), including building a massive solar+battery farm.
- **R&D**: Advancing heteroepitaxy and bonding processes in labs in the US and Germany.

## Why Work Here
- **Culture**: Described as “focused on creators and creating,” with small teams of hands-on contributors, little hierarchy, and low overhead. High performers can build sizable equity ownership.
- **Work Policy**: Roles are predominantly on-site (Wenatchee, WA; Trujillo, Spain; SF Bay Area, CA; Augsburg, Germany; Dubai, UAE). No fully remote jobs currently posted.
- **Notable Perks**: Work on the “universe’s most extreme material” at the intersection of AI, EVs, and advanced manufacturing. Global opportunities across 9 countries.
- **Engineering Culture**: Deep tech, R&D-heavy environment with a 30-year master plan. Emphasis on innovation and building the future of semiconductors.
- **Diversity**: Global group with operations in the US, Spain, UAE, Germany, Taiwan, and more.

## Sources
1. [df.com/about-us](https://www.df.com/about-us)
2. [df.com/working-at-df](https://www.df.com/working-at-df)
3. [careers.df.com](https://careers.df.com/)
4. [jobs.lever.co/diamondfoundry](https://jobs.lever.co/diamondfoundry)
5. [linkedin.com/company/diamond-foundry](https://www.linkedin.com/company/diamond-foundry)

## Other roles at Diamond Foundry

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